From nobody Thu Dec 18 19:50:25 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E11AC7EE29 for ; Thu, 27 Apr 2023 00:10:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242717AbjD0AKF (ORCPT ); Wed, 26 Apr 2023 20:10:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35246 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240955AbjD0AKA (ORCPT ); Wed, 26 Apr 2023 20:10:00 -0400 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E55BA3AAA for ; Wed, 26 Apr 2023 17:09:59 -0700 (PDT) Received: from pps.filterd (m0246627.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 33QGxFQg025361; Thu, 27 Apr 2023 00:09:33 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2023-03-30; bh=VQwaugMMgK/MS0E/urOkz6I4ukGs9iD4CWV4YSx/1xc=; b=J9766iWR8G77hZ7IvzmoZgr4vzzvhIrhZGyputyh0qhGelOn0BZzz+TYbnctnLfB2tXh 00taSjRcT8LFpZEslBFSSAM+7RpAZLoDdPLhJX6aat3Xus05BlbcMz45pXDselmAKTQL 4j9iCnvsVigM9pq/Hn6cRChdsGBc3RcS+agLBtC0Ryp+vhjYvDipYwOzgG+fZ0YtUBKh ywDBGNDhlrFvWYIx2fSMBZzPveVn06sAanl2zckyI7jdur2dQ1+8SRVOAnEI4OnwJAyu qzNFfHr6Mb0eJ2sQWEFZDyiF5ZYwCvt6ZBGbB2qNbzLkGSSfha9z8223RFFTKeqKIbV2 AQ== Received: from phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta01.appoci.oracle.com [138.1.114.2]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3q46622tym-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 27 Apr 2023 00:09:33 +0000 Received: from pps.filterd (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (8.17.1.19/8.17.1.19) with ESMTP id 33QNUZGN007329; Thu, 27 Apr 2023 00:09:32 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 3q4618mpux-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 27 Apr 2023 00:09:32 +0000 Received: from phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 33R09390013888; Thu, 27 Apr 2023 00:09:32 GMT Received: from ca-qasparc-x86-2.us.oracle.com (ca-qasparc-x86-2.us.oracle.com [10.147.24.103]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 3q4618mp42-20; Thu, 27 Apr 2023 00:09:31 +0000 From: Anthony Yznaga To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, rppt@kernel.org, akpm@linux-foundation.org, ebiederm@xmission.com, keescook@chromium.org, graf@amazon.com, jason.zeng@intel.com, lei.l.li@intel.com, steven.sistare@oracle.com, fam.zheng@bytedance.com, mgalaxy@akamai.com, kexec@lists.infradead.org Subject: [RFC v3 19/21] PKRAM: disable feature when running the kdump kernel Date: Wed, 26 Apr 2023 17:08:55 -0700 Message-Id: <1682554137-13938-20-git-send-email-anthony.yznaga@oracle.com> X-Mailer: git-send-email 1.9.4 In-Reply-To: <1682554137-13938-1-git-send-email-anthony.yznaga@oracle.com> References: <1682554137-13938-1-git-send-email-anthony.yznaga@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.942,Hydra:6.0.573,FMLib:17.11.170.22 definitions=2023-04-26_10,2023-04-26_03,2023-02-09_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 phishscore=0 bulkscore=0 mlxlogscore=999 malwarescore=0 mlxscore=0 spamscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2303200000 definitions=main-2304270000 X-Proofpoint-ORIG-GUID: jPzpZYiuahk2b6x6CL1T4-5GRvhXf1gU X-Proofpoint-GUID: jPzpZYiuahk2b6x6CL1T4-5GRvhXf1gU Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" The kdump kernel should not preserve or restore pages. Signed-off-by: Anthony Yznaga --- mm/pkram.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/mm/pkram.c b/mm/pkram.c index d404e415f3cb..f38236e5d836 100644 --- a/mm/pkram.c +++ b/mm/pkram.c @@ -1,4 +1,5 @@ // SPDX-License-Identifier: GPL-2.0 +#include #include #include #include @@ -188,7 +189,7 @@ void __init pkram_reserve(void) { int err =3D 0; =20 - if (!pkram_sb_pfn) + if (!pkram_sb_pfn || is_kdump_kernel()) return; =20 pr_info("PKRAM: Examining preserved memory...\n"); @@ -285,6 +286,9 @@ static void pkram_show_banned(void) int i; unsigned long n, total =3D 0; =20 + if (is_kdump_kernel()) + return; + pr_info("PKRAM: banned regions:\n"); for (i =3D 0; i < nr_banned; i++) { n =3D banned[i].end - banned[i].start + 1; @@ -1334,7 +1338,7 @@ static int __init pkram_init_sb(void) =20 static int __init pkram_init(void) { - if (pkram_init_sb()) { + if (!is_kdump_kernel() && pkram_init_sb()) { register_reboot_notifier(&pkram_reboot_notifier); register_shrinker(&banned_pages_shrinker, "pkram"); sysfs_update_group(kernel_kobj, &pkram_attr_group); --=20 1.9.4